Definition of ratio in US English:


nounPlural ratios

  • 1The quantitative relation between two amounts showing the number of times one value contains or is contained within the other.

    ‘the ratio of men's jobs to women's is 8 to 1’
    • ‘We have reported all standardised mortality ratios as ratios rather than percentages.’
    • ‘We next estimated the likelihood of the data under a unique ratio among all lineages.’
    • ‘We therefore estimated standardised hazard ratios.’
    • ‘Twenty repeated scans were averaged to improve the signal-to-noise ratio in each recorded image.’
    • ‘At MIT you learn about things like bandwidth, power, and signal-to-noise ratios.’
    • ‘Adjusted odds ratios were calculated by logistic regression, whereas adjusted risk ratios were calculated by generalized linear modeling.’
    • ‘The bank's capital adequacy ratio remained at 11.72 per cent.’
    • ‘The banks' non-performing loan ratio reached a record high of 8.09 percent in April 2002.’
    • ‘The control cross (uninfected male x uninfected female) yielded normal family sizes and female-biased sex ratios.’
    • ‘The total chlorophyll/carotenoid molar ratio greatly decreased.’
    • ‘We estimated hazard ratios by using Cox regression with age as the time metric.’
    • ‘The simplest model assumes the same ratio for all branches in a phylogeny.’
    • ‘Measuring the isotopic ratios on Mars will provide clues about possible biological activity.’
    • ‘A ratio higher than 1 in a product group is connected with a comparative advantage.’
    • ‘In contrast, the Argentine central bank's reserve ratio ranged between 193 percent and 82 percent in 2001.’
    • ‘Multivariate logistic regression analysis was used to calculate the adjusted odds ratio of failure rates.’
    • ‘Higher male mortality leads to decreasing male-female sex ratios as the population segment gets older.’
    • ‘Aspect ratio is the ratio between the width of the tire and the height of its side wall.’
    • ‘The ratio varied in the range of 0 to 5.’
    • ‘It is easier to see what is happening if we plot the ratios on a graph.’
    • ‘In addition, nitrogen metabolism increases the molar ratio of amino nitrogen released to filial tissues.’
    proportion, comparative extent, comparative number, quantitative relation, correlation, relationship, correspondence, balance
    View synonyms
    1. 1.1 The relative value of silver and gold in a bimetallic system of currency.


Mid 17th century: from Latin, literally ‘reckoning’, from rat- ‘reckoned’, from the verb reri.